better filtering of synthetic inner classes

src/de/fernflower/main/ClassWriter.java

@@ -296,7 +296,7 @@ public class ClassWriter {
 			if(inner.type == ClassNode.CLASS_MEMBER) {
 				StructClass innercl = inner.classStruct;
 				
-				boolean isSynthetic = (innercl.access_flags & CodeConstants.ACC_SYNTHETIC) != 0 || innercl.getAttributes().containsKey("Synthetic");
+				boolean isSynthetic = ((inner.access | innercl.access_flags) & CodeConstants.ACC_SYNTHETIC) != 0 || innercl.getAttributes().containsKey("Synthetic");
 				if((!isSynthetic || !DecompilerContext.getOption(IFernflowerPreferences.REMOVE_SYNTHETIC))
 						&& !wrapper.getHideMembers().contains(innercl.qualifiedName)) {
 					writer.write(DecompilerContext.getNewLineSeparator());

src/de/fernflower/main/rels/NestedClassProcessor.java

@@ -80,11 +80,12 @@ public class NestedClassProcessor {
     for(ClassNode child : node.nested) {
       // ensure not-empty class name
       if((child.type == ClassNode.CLASS_LOCAL || child.type == ClassNode.CLASS_MEMBER) && child.simpleName == null) {
-        if((child.classStruct.access_flags & CodeConstants.ACC_SYNTHETIC) == 0) {
-          DecompilerContext.getLogger().writeMessage("Nameless local or member class " + child.classStruct.qualifiedName + "!", IFernflowerLogger.WARNING);
-          child.simpleName = "NamelessClass_" + (++nameless);
-        } else {
+        StructClass cl = child.classStruct;
+        if(((child.access | cl.access_flags) & CodeConstants.ACC_SYNTHETIC) != 0 || cl.getAttributes().containsKey("Synthetic")) {
           child.simpleName = "SyntheticClass_" + (++synthetics);
+        } else {
+          DecompilerContext.getLogger().writeMessage("Nameless local or member class " + cl.qualifiedName + "!", IFernflowerLogger.WARNING);
+          child.simpleName = "NamelessClass_" + (++nameless);
         }
       }
     }